<PackageReference Include="NETStandard.Library" Version="2.0.3" />

System.Threading.ReaderWriterLock

public bool IsReaderLockHeld { get; }

public bool IsWriterLockHeld { get; }

public int WriterSeqNum { get; }

public void AcquireReaderLock(int millisecondsTimeout)

public void AcquireReaderLock(TimeSpan timeout)

public void AcquireWriterLock(int millisecondsTimeout)

public void AcquireWriterLock(TimeSpan timeout)

public bool AnyWritersSince(int seqNum)

public void DowngradeFromWriterLock(ref LockCookie lockCookie)

public void ReleaseReaderLock()

public void ReleaseWriterLock()

public void RestoreLock(ref LockCookie lockCookie)

public LockCookie UpgradeToWriterLock(int millisecondsTimeout)